Geodesic Sensor Net - GSN Introduction

chapter 1
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Geodesic Sensor Net Technical Manual S-MAN-200-GSNR-001 • January 31, 2007
CHAPTER 1 GSN INTRODUCTION
GI’s Geodesic Sensor Net (GSN) is designed to acquire dense-array EEG data
using a Geodesic EEG System (GES). This manual, the
Geodesic Sensor Net
Technical Manual , describes the components of the Geodesic Sensor Net, their
integration, and use. It is also a maintenance and safety reference.
EGI currently offers two models of Geodesic Sensor Nets (Figure 1-1):
• GSN 200: the classic dense sensor array, available in densities of 64, 128, and 256
channels.
• HydroCel GSN (HCGSN): a sleeker dense sensor array, available in densities of
32, 64, 128, and 256 channels. The HCGSN features low-profile pedestals,
convenient wire management, shielded cables, and prominently marked sensor
tops. This model comes in two versions:
°
with sponge inserts : each pedestal is installed with a sponge, allowing it to use
EGI’s HydroCel Saline electrolyte solution for 2-hour recordings.
°
without sponge inserts : each pedestal contains only an electrode (no sponge),
which is individually filled by a syringe containing EGI’s HydroCel HS
electrolyte formulation for 12-hour recordings.
Figure 1-1. The GSN 200 (left) and the HCGSN (right)
E